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单项选择题
A: Thank you for looking after the cat for me.B.().I love cats.

A. Thank you
B. It’s my pleasure
C. By the way
D. No, of course not
E. Never mind
单项选择题
正三棱锥A—BCD的体积为（ ）．
A．<br /><img src="{$uploaddir}/50f6fca2-1479-48ae-a9ca-5e31a60ee65f.jpg">
B．<br /><img src="{$uploaddir}/0f60c3c6-3e0a-4fd1-8137-61ae36f5b435.jpg">
C．<br /><img src="{$uploaddir}/f9d192a5-e66f-41bd-a8ff-dfc047bfc147.jpg">
D．<br /><img src="{$uploaddir}/6e9c5763-1c58-456b-9e4a-f142f8df2633.jpg">
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